The pumping system includes a pipe section having a uniform inside diameter, and a production water piping circuit connected to branch pipes on the upstream and downstream ends of the pipe section, forming a loop with the pipe section. The production water circuit comprises a pump and valves for pumping production water into the pipe section through the inlet branch pipe and out through the outlet branch pipe. There is also provided a method for pumping upload water and fish along the pipe section, comprising the steps of drawing production water out of the pipe section through the downstream end of the pipe section, and simultaneously inducing a flow of upload water and fish through the pipe section. The method also includes the step of pumping production water into an upstream end of the pipe section and causing a flow of upload water and fish along the pipe section.